please ignore this patch. I will submit a corrected one.
On Mon, Jan 27, 2025 at 5:20 PM Srikanth Kiran Kotagiri
<srikan...@gmail.com> wrote:
>
> For Fragmented MP4 files where the audio and video streams are written to
> seperate fragments, the -ss option will cause the file pointer to be set to
> the first available fragment. This is due to an interaction in
> search_frag_timestamp() function and get_frag_time() functions.
>
> With this change, we first verify that the fragment does not actually contain
> the requested fragment before just sending AV_NOPTS_VALUE.
> ---
> libavformat/mov.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/libavformat/mov.c b/libavformat/mov.c
> index c016ce8e41..f3e4f4deff 100644
> --- a/libavformat/mov.c
> +++ b/libavformat/mov.c
> @@ -87,6 +87,7 @@ typedef struct MOVParseTableEntry {
> static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);
> static int mov_read_mfra(MOVContext *c, AVIOContext *f);
> static void mov_free_stream_context(AVFormatContext *s, AVStream *st);
> +static int mov_switch_root(AVFormatContext *s, int64_t target, int index);
>
> static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
> unsigned len, const char *key)
> @@ -1680,6 +1681,27 @@ static int64_t get_frag_time(AVFormatContext *s,
> AVStream *dst_st,
> return frag_stream_info->sidx_pts;
> }
>
> +
> + // Check if the requested stream is present in the fragment
> + int stream_present = 0;
> + for (i = 0; i < frag_index->item[index].nb_stream_info; i++) {
> + if (dst_st->id != frag_index->item[index].stream_info[i].id)
> + continue;
> + if ( get_stream_info_time(&frag_index->item[index].stream_info[i])
> != AV_NOPTS_VALUE) {
> + exists = 1;
> + break;
> + }
> + if ( mov_switch_root(s,-1,index) < 0)
> + return AV_NOPTS_VALUE;
> + if ( get_stream_info_time(&frag_index->item[index].stream_info[i])
> != AV_NOPTS_VALUE) {
> + exists = 1;
> + break;
> + }
> + }
> + if (!stream_present)
> + return AV_NOPTS_VALUE;
> +
> +
> for (i = 0; i < frag_index->item[index].nb_stream_info; i++) {
> AVStream *frag_stream = NULL;
> frag_stream_info = &frag_index->item[index].stream_info[i];
> --
> 2.39.5 (Apple Git-154)
>
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
